Eric Blake f3aee13bfa Improve M4 path searching during configure. ... * lib/autoconf/programs.m4 (AC_PATH_PROGS_FEATURE_CHECK): New macro. (_AC_PATH_PROG_FEATURE_CHECK): Rename... (_AC_PATH_PROGS_FEATURE_CHECK): ...to this, add defaulted action parameter, and kill side effects. (_AC_PROG_GREP, AC_PROG_SED): Adjust callers. (_AC_FEATURE_CHECK_LENGTH): Kill extra whitespace. * m4/m4.m4 (AC_PROG_GNU_M4): Don't stop searching until working m4 is found. (AC_PATH_PROGS_FEATURE_CHECK): Add backwards compatibility hack to allow bootstrapping with autoconf 2.61. * configure.ac (M4): AC_PROG_GNU_M4 now exits on failure. * configure: Regenerate. * doc/autoconf.texi (Generic Programs): Document new macro. * tests/mktests.sh (au_exclude_script): Exclude auto-testing new macro. * tests/semantics.at (AC_PATH_PROGS_FEATURE_CHECK): New test. * NEWS: Document the change. * THANKS: Update. Reported by Hans Aberg.		2007-09-08 14:48:49 +00:00
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m4.m4	Improve M4 path searching during configure.	2007-09-08 14:48:49 +00:00